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DM365的osd存储回放



请问如何实现将我在osd层显示的字符,或其他东西叠加到video层显示的数据流中,以便存储回放时仍然可以看到之前叠加的字符?例如,如何将时间叠加到一幅图片中保存下来?

请高手,指点下方向,非常感激